Initially I put an extra 4 x 10mm bolts through the rear frame Bl**dy tight and it still flexed. I have since had the rear frame welded in with additional round tube bracing welded in diagonally using the stiffness of the roll cage to the back end.
John Dry has also welded his rear frame in and put an additional cross member in. With the power you will have going through the back end once the new engine is up an running you will almost certainly need to upgrade and do something similar.
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